It can take a little getting used to, closing your MetaCups reusable K-Cups, as pushing straight down will not create the proper seal to keep grinds from overflowing into your brewer. Below are some handy tips on how to close your MetaCups reusable K-Cups. Most customers say, after you try it 2-3 times, you get the hang of it and achieve a perfect seal every time. Email us if you are still having trouble.